Abstract

The effect partially replacing neodymium with barium or strontium has on the thermal behavior of Nd_0.85A_0.15MnO₃ (A = Ba, Sr) manganites is investigated. The temperature aspects of the transformation of their crystalline structure under different pressures of an oxygen atmosphere are studied. The sequence of phase transformations during the thermal dissociation of the compounds under reduced oxygen pressure, their thermodynamic characteristics, and the changes in the standard enthalpy and entropy of the formation of compounds from elements are determined. It is established that the partial substitution of neodymium with barium or strontium affects the thermodynamic state of the Nd–Mn–O system.

中文翻译：

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Nd 1–x A x MnO 3的热稳定性（x = 0，0.15; A = Ba，Sr）

摘要

效果部分地与钡或锶代替钕对钕的热行为_0.85阿_0.15的MnO ₃（A =钡，锶）锰氧化物进行了研究。研究了在氧气气氛不同压力下其晶体结构转变的温度方面。确定了化合物在降低的氧气压力下热分解过程中的相变顺序，其热力学特性以及由元素形成化合物的标准焓和熵的变化。已经确定，钕被钡或锶部分取代会影响Nd-Mn-O系统的热力学状态。